I've been vaguely following the Dr Seuss vs Mashup court proceedings... if you haven't; basically the copyright lawyers are claiming copyright defense for a mashup book which doesn't use a single owned Seuss character or story line. They are basically suing to protect the "look" of Seuss which as far as I can tell is anything that rhymes with hand drawn art.

The whole thing is just disgusting to me. Regardless; one of the creatives has done an interview entirely in rhyme which is pretty impressive in itself:
https://fanfilmfactor.com/2018/07/31/oh-the-answers-i-boldly-got-about-the-dr-seuss-star-trek-mash-up-interview-with-glenn-hauman/

Oh-the-places-youll-boldly-go11-768x354[1] (resized).jpg

This is a very slippery slope.

Think of the Homebrew community... a Retheme would no longer be considered FairUse because it's based upon the geometry of the original PF. Now this is all "mute" as long as the Homebrew doesn't try to go into production... but they could easily get an enforceable C&D in the mail.

While I understand the desire to prevent copycatting or "Style theft"; it really isn't an good argument that this having Dr Seuss sue them based upon it. If they win; it'll have far reaching implications across the board.